Responses

The D50 is a single-lens reflex - you cannot use the LCD monitor in real time. The viewfinder is completely optical, through the lens, using a mirror which flips out of the way when you take a picture. At all other times, the sensor is covered by the mirror and a shutter.

Hi William, I just came back from a trip to the local WalMart to replace the battery on my digicam. I had so much fun although the lady at the counter was very mean to me. Then I headed back home and finally got home. Pictures of my trip will be posted later.

By the way, you cannot use the TFT screen as a constant realtime viewfinder. It can only playback images once they have been taken.

As others have pointed out, you cannot use the D50 LCD as a viewfinder, the sensor is blind until the mirror is flipped out of the way. About the Canon 20Da, it's designed to be used with telescopes, and has a special preview mode to help with the image focusing, however the LCD only displays 5 to 10% of the frame, so you still need to use the optical viewfinder to frame the image.